Audible signal or annunciator for incubators.



H. R. LIGHTOAP. AUDIBLE SIGNAL OR ANNUNGIATOR FOB. INGUBATOBS.

APPLICATION FILED 0012.11,1911. v

Patented July 30, 1912.

2 SHEETS-91132531.

INVENTOR a. R; LKGHEGM. AUDIBLE S'IGNAL 0B AHHUEGIATQB EOE IBIOUEATOBS.

' APPLIOAIIUE 111.21) 001 .11, 1911.

V. nNYEmToR' WITNESSES ATTO NEYS HARRY RUSSELL LIGHTCAP, 0F GREENEiBURG,Z ENNSYLVANIA.

AUDIBLE SIGNAL OR. ANNUNCIATOE FOR INCUBATORS.

Specification of Letters Patent.

Patented July "1), 13612.

Application filed October 11, 1911. Serial No. 654,188.

To all whom it may concern:

Be it known that I, HARRY RUSSELL LIGHT- car, a citizen of the UnitedStates of America, residing at Greensburg, in the county of Alleghenyand State of Pennsylvania,

Annunciat-ors for Incubators, of which the following is a specification,reference being had therein to the accompanying-drawing.

This invention relates to an audible signal or annunciator forincubators, and the primary object of my invention is to provide athcrmalalarm that is positive in its action, durable and applicable tovarious types of ii'icubators.

Another object of this invention is to provide an audible electricsignal that can be adjusted to sound an alarm when the teln- 1(311117111X? 0t or,l.owcred,'the alarm notifying the attendant of theincubator that the same requires attention to insure a perfectincubation of the contents of the incubator.

A further object of this invention is to provide a portable electricalarm that can be easily placed upon an incubator and connections madefor sounding an alarm when there is a change of temperature, the alarmmechanism being arranged in a compact casing that can be easily openedand proper connections made for operation in connection with anincubator.

With the above and other objects in ,view, the invention resides in thenovel construc tion, combination and arrangement of parts to behereinafter specifically described and then claimed.

Reference will now be had to the drawings, wherein Figure 1 is aperspective view of an incubator provided with the alarm, Fig. 2 is anenlarged front elevation of the alarm Fig. 6 i'sf'adetail sectional viewof a plug adapted to form part of the alarm inechanism.

. The reference humeral 1 an inhave invented certain new and use-- fulImprovements in Audible Signals or an incubator is slightlyraisedcubator. of the ordinary and well known type having a hot air flue2 beneath which is located a lamp or heating medium 3 of the incubator.Arranged upon. the top of the incubator is a ll-shaped metallic bearing4 and fulcrumed in said hearing by a pin 5 is a sleeve 6 si pporting a,rod 7. ()nc end of the rod is hook-shaped, as at 8 and provided with abell or dome 9 directly above the flue 2. The opposite end. of thetulcruined rod 7 has an adjustable counter- I balance weight 10 that isfixed upon said rodby a set screw 11. 1 Resting upon the top of theincubato 1 adjacent to the weighted end oi the rod 7 is a rectangularcasing 12 having the front wall 13 thereoiprovided. with an opening 14'that can be closed by a door 15, which is hinged, as at 16 to the edgeof the front wall 13. Located within the casing 12 is a battery 17 orother source of electric energy and a conventional. form of electricbell 18. The bell 18 has the binding post 19 thereof connected. by awire 20 to the binding post 21 of the battery 17, and said battery hasthe other binding post 22 thereof connected by a wire 23 to a pivotedhook 24 carried'by an end wall of the casing 12. The front wall 13oft-he casing and the door15 have registering slots providing clearancefor the hook124. The other binding post 26 of the bell 18 isconnected'by a wire 27 to a binding post- 28 carried by the rear wall ofthe casing 12, and this binding post is sup ported by a plug socket 29that extends through the rear wall of the casing 12. The socket 29 isadapted to receive a plug 30 to which is attached a wire 31. oppositeend otthe wire 31 is connected by a screw 32 to a clasp 33 that ispivotally connected to one of the side arms of the bearing 4. Secured tothe inner side of the door 15 at the hinged edge thereof is a verticalbracket 84 having a longitudinal slot 35, an

openin 3,6 and an arm"37 that extends crosswise of the door to the freeedge thereof. Engaging this arm is the hook 24 adapted to place thebracket 34- in the electric circuit of the alarm mechanism, as willpresently apt" Adgustably mounted in the brac'imt be by a set screw 38is any eye The A 39 carried by the upper end of a rod 40 extendingthrough the opening 36 into the bracket. The lower end of the rod 40 isbent to provide a crank 41 upon which is mounted a block 42 havingconvex upper and lower faces 43. Engaging the cony ex faces 43 are flatsprings -14- having the ends thereof secured by screws 45 or otherfastening means to the ends of a strap l6 secured, as at 47 to thereduced end 48 of a contact piece 49. The contact piece 49 is looselymounted upon the crank l1 and the end of said piece is bifurcated orslotted, as at 50 to provide contact arms 51. The contact arms 51- arearranged whereby the rod 7 will extend through the slot 50 and thetilting movement of the rod 7 causes said rod to contact with one of thearms 51.

Assuming that the alarm mechanism is in position for operation, as shownin Figs. 1 and 2, a rise or change in the temperature within theincubator raises or lowers the bell or dome 9, causing the rod 7 to engage one of the contact arms 51. The contact piece 49 will be slightlymoved and immediately restored to its normal position by the springs 44when the rod 7 is moved out of engagement with the arms 51. By yieldablymounting the contact piece 49 upon the rod 40, a positive contact isassured between said rod and one of the contact pieces, besides thefulcrum of the rod is not strained as though the end of the rod wasfirmly held by one of the contact pieces. Immediately upon the rodengaging one of the contact pieces, the circuit is as follows: from thebinding post 22 by wire 23 to the pivoted hook 24-, through said hookand the arm 37 to the rod 40 Within the bracket 34, through said rod andone of the contact pieces tothe rod 7, through said rod and the bearing4 to the clasp 33, by wire 31 to the plug 30, binding post 28 by wire 27to, the binding post 26 of the bell 18, and by wire 20 from the bindingpost 19 to the binding post 21 of the battery. The bell 18 is. soundedto attract the attention of the attendant of the incubator in order thatthe attendant can regulate the lamp or heating medium 3 to obtain aproper temperature within the incubator. When the device is not in use,the clasp 33 is detached. also the plug 30, said clasp, plug and wire 23being placed within the casing 12. The hook 24: is then swung inwardlyand the door 15 can be closed. By adjusting the arm 40. the contactpiece 49 can be correctly positioned relatively to the rod 7. forinstance for obtaining a more positive action when the temperature risesthan when the temperature lowers. and vice versa, thisbeing possible byadjusting the rod 40 whereby one of the arms 51 will he in closerproximity to the rod than the other arm.

From the foregoing it will be observed that the thermal. alarm includesa heat actuated rod that is arranged in a normally open circuit adaptedto be closed by a movement of said rod to sound an electric hell orother audible signal. The parts of the alarm are compactly arrai'igedand can be disposed of as an attachment for incubators or as a separatealarm device for various purposes.

l Vhat I claim is 1. In a thermal alarm for incubators a casing, a.hinged door carried thereby and adapted to close said casing, a batteryarranged in said casing, an audible alarm within said casing, anadjustable contact piece supported by the inner side of said door andnormally in an open circuit with said alarm and said battery, and afulcrumed heatactuated rod extending through the end of said contactpiece when said door is open to contact with said contact piece andclose said circuit.-

2. In a thermal alarm for incubators, a casing having a hinged door, abattery arranged in said casing, an audible alarm within said casing, anadjust-Mile contact piece supported by the inner side of said door andnormally in an open circuit with said alarm and said battery, afulcrumed heat actuated rod extending through the end of said contactpiece when said door is open to contact with said contact piece andclose said circuit. and means including a plug carried by the rear wallof said casing and pivoted hook carried by the inner side of one of theend walls of said casing and adapted to control said. circuit.

3. In a thermal alarm for incubators, the combination with afulcrumedheat actuated rod, of a casing, a hinged door carried by said casing, abattery located in said casing, a bell arranged in said casing, an

adjustable and yieldable contact piece supported by the inner side ofsaid door and adapted to be engaged by said rod, and a pivoted hookcarried by the inner side of the end wall of said casing and adapted toextend through the front wall of said casing and said door when saiddoor is in an open position to establish in conjunction with the contactpiece of said door a normally open circuit between. said bell, battery,rod and contact piece adapted to be closed by a movement of said rod.

4. in a thermal alarm for inciilbators, the combination with a casing,an electrically operated signal arranged within. said casin a hingeddoor carried by said casing,

I I I an ad ustable contact piece carried by said door, a t'ulcrumedheat actuated rod in a normally open. circuit with said electricallyoperated signal and adapted to engage said contact piece to close saidclrcult to operate pivoted hook carried-by the inner side of the endWall of said casing and adapted to place said rod and said contact piecein a V normally open circuit with said electrically operated signal.

In testimony whereof I afiix my signature in the presence of twoWitnesses.

HARRY RUSSELL LIGI-ITCAP.

Witnesses:

- MAX H. SRoLovrrz,

CHRISTINA T. H001).

